JBL L300 Measurements
- Carlos Westman
- Dec 30, 2023
- 1 min read
Updated: Jan 18, 2024
These are the original JBL L300 crossover measurements. It's not meant to be precise but a reference to compare when tunning the new crossover. Measurements are taken at the normal point of listening using a Beringher 8000 microphone, a Solid State Logic SSL2+ sound card and REW. I also have recorded sections from a few songs as a reference, disconnecting the original crossover is a lot of work, the speaker is heavy and access to the drivers is constrained so I may not be listening to the original crossover again in the foreseeable future. The control levels of the L300 are adjusted to the heavy bass character of the 47 valve. This is a very idiosyncratic system, so the idea is not to have a laboratory measurement but to have a reference of how my system sounds when I listen to music, the way I like to listen to it.
The measurement setup:
SSL2+
> Single Ended tube amplifier with Pentode 47
> JBL L300
> Beringer 8000
> SSL2+
The listening setup:
Benz Micro Glider SL on Victor TT-101 Direct Drive turntable
> Phono stage EAR 88-PB
> Single Ended tube amplifier using Pentonde 47
> JBL L300
> Beringher 8000
Frequency measurement
Keep in mind the crossover cuts are at 800hz and 7khz and there are level controls. These are the levels used at the L300 when measuring, and it was mostly because of the heavy bass character of the 47 tube which is spectacular but needed tunning to make voices sound natural
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